has anyone found a workaround for this yet?

i'm having the same problem....emails created in outlook when i was formerly on an exchange server and were sent/received with other former users of that exchange server all show up as (unknown sender) in gmail.

this thread started 8 months ago and there are others going back almost a year
http://groups.google.com/group/Gmail-Help-POP-and-IMAP-en/browse_thread/thread/6c6801dd433de1f0/7c105529d66e71e0?lnk=gst&q=imap+unknown+sender#7c105529d66e71e0
http://www.google.com/support/forum/p/gmail/thread?tid=189f49dc15a5657d&hl=en

still no solution...?